Trip-hook



R. P. SMALL- TRIP HOOK.

VAPPLICATION FILED MAR.11,1919.

1 ,333 ,5 1.1. Patented Mar. 9, 1920.

@Hof/Mago A UNITED l sTATEs PATENT oErioE.

, ,Y BAY P. SMALL, or sim DIEGO, cAiIroRNIA.

TRIP-HOOK.

To all whom it may concern:

Be it known that I, RAY P. SMALL, a citizen of the United States, residing at San Diego, in the county of San Diego and State of California, have invented certain new and useful Improvements in Trip-Hooks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to hooks, and it relates more specifically to an improved trip hoolr for hoisting, aerial transporting and similar operations.

One object of this invention is to simplify and generally improve upon devices of this character by providing' an arrangement of simple, strong and accurately designed parts.

Another object of the invention is to provide a device of this character which can be operated with theA maximum ease and despatch.

Other objects and advantages will become apparent to persons who read the following details of description in connection with the accompanying drawings in which:

Figure 1 is a side elevation of my improved `trip hook.

Fig. 2 is a front edge view shown in Fig. 1.

Referring' to these Ydrawings inl detail, in which similar reference characters correspond with similar parts throughout the several views, the invention consists broadly in forming a hook of two hook members 5 and G. pivotally connected together at 7 and havof the device ving their bearing surfaces or load supporting portions directly above the pivot 7, so that the main hook member 5 relieves the pivot 7 of the greater part of the weight supported by the hook, and so that the subsi diary hook member 6 receives only a sufficient portion of the weight to cause it to automatically release the weight when the subsidiary hook member is itself released by means described hereinafter. In order to effect these results, the lower end portion of the main hook member has its load-bearingsurface 8 inclined -downward and outward toward its lower end, and the lower bearing surface 9 of the subsidiary hook-member is downwardly and inwardly inclined and meets the bearing surface 8 at a point directly over the axial center of the pivot 7. It will be seen, therefore, that when a load is Y Specification of Letters Patent.

applied to the-hook, as through the medium of a link 10, the said lint: has contact with the main andsubsidiary members at their member being disposed between the two side plates which constitute the main hook member 5, as shown inv Fig. 2, and the upper end of this member is normally engaged by a notch l2 of a lever 13 which is pivot'ally connected to the main hook member 5- by means of a pivot 14. The notched arm of the lever 13 extends between the plates of the main g Patented Main-9, 19.20. l Application filed March 17, 1919. Serial N o. 283,131.

hook member, and the other arm of this lever f extends backward from between the plates and is provided with an eye 13 which may be engaged with a cord or cable 15 which is operatable to swing the lever 13 into its dotted line position so as to release the subsidiary hook member. In order that the lever 13 may ksecurely hold the subsidiary hook member in its effective position, a retractile spring 16 has one end secured to the lever at 17, and its other end is secured to the main hoek member at 18, it beingunderstood that this spring is located between the plates of the main hook member.

For the purpose of guiding the cord or cable 15 and preventing it from becoming entangled with the subsidiary hook member 6 or with the load carried by the hook, an arm 19 has one end provided with an eye 2() through which the flexible element 15 extends, and the other end-of the arm 19 is secured between the plates of the main hook member by means of rivets or bolts 21. The inner end of the arm 19 is broadened and extended laterally of the main portion of the arm 19 so as to provide a secure anchorage for this arm and to provide a simple effective means for limiting the movement of the subsidiary hook member to its operative position, that is, into the position in which its longer arm vis engageable with the notch 12 of the tripping lever 13, and its shorter arm is insuch position relative to the main hook member, that these members 5 and 6 form a substantially t-shaped hook. rlhis facilitates the operation of the device and also protects the spring 16 from being struelrA b v the arm l1 when it is swung into its eteetive position.

An apertui'ed spacing block 22 is disposed between the upper ends or' the plates 5, said ripper ends being' provided with apertures to correspond and register with those of the spacingl member 22, and rivets or bolts Q3 and Q-t extend through the smaller apertures of the plates and Aspacing member and unite them rigidlj.- with one another. in eye Q5 is formed lv registering apertures through the spacing block and plates 5, and a supporting member :26 engages with the eye 25 and ina),v be connected with. anv means, (not shown) for cooperating with improved hool; in supporting, hoisting` and convejvingj loads.

.ltho'ugh l have described this embodiment of my invention veri' speciiicallv, it is not intended to limit this invention to these enact details oiI construction and arrangement of parts, but l am entitled to make changes within the scope oi? the inventive idea disclosed in the foregoing description and :following` claim. A

`What l claim as in v invention is:

i trip hoolr comprising two plates spaced from one another and united to torni a main hook member having a pivot-bearing at its lower end and having a downwardly and outwardly,7 inclined bearing` surface extending over said pivot-bearing, a pivot in said pivot bearing, a substantiallT U-shaped subsidiary hook-member mounted on said Pivot and haring one of its arms movable in the 'space between the plates of the main hookznember, the other arm oi the U-shaped hook-member `having a bearing surface which normally inclines downward toward said niain hook-member and meets the latter at a point above said pivot7 a detaining and releasing lever pivotally mounted between said plates and having` a notch to engage with the iirst said arm of the subsidiarT hook-member, a spring inthe space between said plates and connected thereto and to said lever and being eiective to yielding-ly hold said lever in position to engage with and hold said subsidiary hook-member in its normal or elfective position and an arm having an eve4 in one end to guide a rope which mayv be connected to the lever for causing,- it to release the subsidiary hook member, said arm having its other end secured between said plates in a position to stop the subsidiaryhook member in position to be engaged by the notch of said lever.

ln testin'ionj,7 whereof I have hereunto set my hand.

RAY P. SMALL. 

